I've tried to search some list of the largest of DSO but I can't find one, so I compiled a list by my self.

I just want to know some  DSO that larger than 1º

Here's my list:

http://agil-and-lyla.blogspot.com/2008/05/list-of-large-deep-sky-objects.html

I found that about 12 DSO's are larger than 1 degree, i.e: LMC, SMC, Hyades, NGC 6231, NGC 7000 (North American Nebula), NGC 3532, M31, NGC 2516, M45, Veil Nebulas, and Coathanger (Cr 399).

(Double Clusters isn't on the top 12 since it's "only" 56 arcminutes)

Did I miss something? please cmiiw. 

 Alnair - Go to the NGC web site at "http://wwwngcic.org/obslist.asp". There you can go through every constellation and make up observing lists that are customized for your needs. The list(s) are printable and include just about every type of DSO  with limiting magnitude of 17!  Good hunting, Mr Q

IC 4665, Kemble's Cascade (an asterism), M42, M44, Melotte 20 (the Alpha Persei Association), Melotte 111 (the Coma Berenices Star Cluster), NGC 1499 (the California Nebula), NGC 3372 (the Eta Carinae Nebula), and the Ursa Major Moving Cluster are also larger than 60 arc minutes in apparent size.

BTW, NGC 7000 is known properly as the North America, not North American, Nebula.

Dave Mitsky

Thanks Mr Q and Mr Mitsky,

Which one that you think more suitable for observing the Large DSO: a pair of binoculars (with average FOV 5deg) or a very short tube apochromatic refractor such as ZenithStar 66mm from William Optics?

A fast newt!

 Alnair - Binoculars with a 5 degree f.o.v.(or slightly larger) is a must for some of the largest DSOs that have low surface brightness. If you use a telescope with enough f.o.v. (similar to binoculars), the chances are that the images won't be as sharp as one with a smaller f.o.v. (poorer quality optics, etc.).

 Where you are located, now is the time to check out the very large globular Omega Centauri, which you can see with the unaided eye (3rd magnitude) even in fairly light polluted skies. Though scopes show it nicely, binoculars will show its full diameter (slightly larger than the Moon). You can also check out the large, bright OC 47 Tucan, lower in the southern sky.

  Mr Q
 

mr Q:

 Alnair - Binoculars with a 5 degree f.o.v.(or slightly larger) is a must for some of the largest DSOs that have low surface brightness. 

 Where you are located, now is the time to check out the very large globular Omega Centauri, which you can see with the unaided eye (3rd magnitude) even in fairly light polluted skies. 

  Mr Q

Much obliged, MrQ

I live in Yogyakarta Indonesia about 7º S. Of course I would like to see Omega Centauri and 47 Tucanae but unfortunately my eyes is not as keen as normal people, so I guess I need a pair of binoculars. And also, the moon is so bright so I think I'll wait for a few days until the moon isn't full anymore.

By the way, do you have any favourite bino?

 Alnair - I use a pair of 10x50s with fully coated optics and Poro prisms. I also use a pair of 11x70 "Little Giants". I used to use a pair of 20x60 but holding them steady enough for good views was very hard. If you are looking to buy a pair, stay away from "zoom" types (very poor optics as a trade-off for zoom option) or wide field types (same reason). Even cheap binos will work but for most astronomy work, choose ones with fully coated optics and Poro prisms. These will give you the most light transfer and sharp, clear images of stars.

  By the way, both objects I mentioned in my last post can be easily seen with the unaided eye with no Moon present in the sky. I envy your location's latitude, being able to see a lot of the southern celestial sky. I'm at 34 degrees north and though I can't see Tucan 47, Omega is about 10+ degrees above my 50 mile distant horizon.  Mr Q
 

I would opt for the small refractor due to the ability to use a nebula filter and to vary magnification.  However, I'd want at least a bit more aperture.  An 80mm achromat or ED would provide somewhat better views of deep-sky objects.  I've owned a number of fast 80mm refractors and have been quite pleased with them.

There are reviews of the 66mm f/7 William Optics triplet at http://www.cloudynights.com/item.php?item_id=1334 and http://www.cloudynights.com/item.php?item_id=1212

As cheap as binoculars are nowadays, you should consider getting one too.

Dave Mitsky